Something that we must never allow to be repeated. Ever.
Something that was, and still is, all-around terrible. Absolutely unthinkable.
In 1940's German leader Adolf Hitler along with his Nazi party decided that all those not meeting Aryan standards or did not have a life worth living should be exterminated . Almost 11 million dead. 6 million of these people were Jewish. Other racial/ethnic groups targeted include Roma(Gypsies), German male homosexuals, German mentally/phisically impaired,Soviet POWs, Jehovah's Witnesses,Germans openly against nazi regime, people pf Polish decent, Slavic people, and people of African decent.
This term comes from Roman text meaning a sacrafical fire. This makes it seem almost as if this was being used for the good of a population. In hebrew and now being used in modern text as the Shoah which means complete destruction and anhiliation.